Yup. I've been noticing this trend too. Good to have data.
GaaS is the future.
Edit :
People are missing the forest from the trees. Mat is saying that, yes, super high quality SP games with great marketing succeed. That's not practical for every game.
It's also notable that a lot of service games that really succeed don't actually review very well in comparison.
Ghost Recon Wildlands (2017's top selling game until Destiny): 70 Metacritic
For Honor (was the #2 2017 game for a long time, then #3): 78 Metacritic
Rainbow Six Siege (has more players on XBL than CoD or Battlefield): 73 Metacritic
Splatoon 2 (I think this is the #2 selling Switch game, though plausibly #3): 83 Metacritic
Destiny (Was the biggest ever new IP launch at the time): 76 Metacritic
The Division (Topped Destiny to become the biggest ever new IP launch): 80 Metacritic
I think we would be pretty pressed to find this many $60 singleplayer games rated in this range this generation that sold well.